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There has been an increasing demand for scandium (Sc). However the supply is insufficient because the separation and recovery of Sc as a byproduct from ores is difficult. In this study, extraction and separation of Sc from a sulfuric acid solution containing transition metals such as Al, Fe, Mn, Co, Ni and Zn was investigated using a β-diketone, HTTA and a neutral extractant, TOPO. Due to the synergistic effect with the two extractants, Sc was effectively and selectively separated even from Fe, the separation of which is difficult with HTTA alone. The extraction mechanism was examined and it was revealed that Sc is extracted with three HTTA and one TOPO molecules. Scandium was readily stripped from the extracting phase by 1 M sulfuric acid. The potential use of the combination of the β-diketone with TOPO for the recovery of Sc in a refining process was demonstrated.

solvent extraction research and development, japan

Selective Extraction of Scandium from Transition Metals by Synergistic Extraction with 2-Thenoyltrifluoroacetone and Tri-&lt;i&gt;n&lt;/i&gt;-octylphosphine Oxide